Do you have any suggestions for some kind of heat reflecting material for roofs? Can't afford to replace the roof, but it heats up like an oven in this house. Spraying the roof with water helps but is not at all practical.

The best way to come up with topics is to read other blogs, magazines, newspapers, or books. Even if it's something you heartily disagree with, you could write a blog post explaining why you oppose the ideas you read.

There's a lot more in the library than there is in any one person's head. Make use of it.